'85 300D (271K) The other day I was on my way to work and after about 20 minutes of driving, I was about 1/4 mile from my work and I noticed that the vehicle started shifting hard. When I parked it and went to shut it off, it didn't shut off right away. After about 5 seconds it shut off. Then when I exited the vehicle and went to lock the doors I noticed that the central locking system was barely working. I thought to myself, "Just what I need--a vacuum problem!"

Well when I left for the evening, it started up fine, shifted fine, shut off fine and locked fine. As a matter of fact, it has been working fine for 3 days now.

Is this one instance of vacuum problem, something that I should be concerned with? It was raining heavily that day and I did have my usual puddle in the rear passenger footwell. Does the vacuum lines run along the footwell raceway with the electrical lines?